sg reserved buffer sharing

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Hi All,

We use sg's reserved buffer through mmap in kernel 2.6.18.  This has
been working well for us until a new requirement comes up.  We need
the capability to share the buffer across processes.  For instance,
after a command is completed in process 1, we want to dump out the
buffer in process 2.  Is there any way to do this? Based on sg howto
document, sg reserved buffer is allocated per sg file descriptor.

Thanks,
Fajun
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